Đáp án `+` Giải thích các bước giải:

 1.

1) `(8/3)^8 . (9/4)^8`

`= (8/3 . 9/4)^8`

`= (2 . 3)^8`

`= 6^8.`

2) `(3/7)^12 . (21/5)^12`

`= (3/7 . 21/5)^12`

`= (9/5)^12.`

3) `(-4/13)^5 . (26/5)^5`

`= (-4/13 . 26/5)^5`

`= (-8/5)^5.`

4) `(-10/3)^4 : (-5/6)^4`

`= (-10/3 : (-5)/6)^4`

`= (-10/3 . (-6)/5)^4`

`= (2 . 2)^4`

`= 4^4`

`= 256.`

5) `(4/7)^19 : (-12/35)^19`

`= (4/7 : (-12)/35)^19`

`= (4/7 . (-35)/12)^19`

`= (-5/3)^19.`

6) `(-4/7)^11 : (16/(-28))^11`

`= (-4/7 : (-16)/28)^11`

`= (4/7 . 28/16)^11`

`= (4/4)^11`

`= 1^11 = 1.`